Self-adjusting-transmission mechanism



July 24,v 1923. 1,462,809 A. c.H.Gl| L SELF ADJUSTING TRANSMISSION MEQHANISM Filed Patented July 24, 1923a Niro stares 1,462,899 TENT QFFICE.

CHARLES H. GILL, OF CHICAGO, ILLINOS" J'uly '7, 1921, Serial No. 483,106.

To all whom t may concern:

Be it known that I, CHARLES H. GILL, a citizen of the United States, and resident of Chicago, in the county of Cook and State of lllinoisi,.have Ainvented a new and useful Self-Adjnsting-Transmission Mechanism, kof

` which the following is a specific-ation.

This invention originally formed a part of my application for Letters Patent for transmission mechanism, filed December 29th, 1920, Serial No. 433,930, and has been `divided out of that application. Reference may be had to the said prior application in connection with this application, which relates to mechanism for transmitting rotary motion from a driving to a driven shaft at varying speedratios therebetween and for automatically varying the said ratios to meet variations in the resistance offered 'to the rotation of the said driven shaft. Reference may also be had, in connection with this application, to `my Letters Patent for friction transmission mechanism, No. 1,410,747, dated March 28th, 1922.

The objects of my invention are, first, to provide a friction driving disk; second, to provide a single friction wheel driven by the said friction driving disk; third, to provide means for yieldably coupling` the said `.friction wheel to a driven shaft; fourth, to

provide automatic ymeans for moving the said friction wheel radially of thesaid friotion driving disk to change the ratio of the rotary speed of the said friction wheel to the rotary speed of the said friction driving disk inversely to variations in the `degree of resistance offered tothe rotation of the said driven shaft; and, fifth. to provide means for adjusting the said automatic means.

l attain these objects, and others may hereinafter appeanby the mechanism illustrated in the accompanying drawings. in whiclil ,n

Figure 1 is a front elevation andv partly sectional view of a preferred construction of my invention, the friction driving disk and the shafts being shown partlyV broken away;

Figure 2 is a section taken on the line 2-2 of Figure 1; Figure 3 is a front elevation and partly sectional view of a modified form of this invention, the driving friction disk and the shafts being shown partly broken away; Figure 4 -is a sectiontaken on the line 4:44 ofFigure 3; Figure 5 is a section taken on the line 5-5 of Figure 3;

Renewed April 14, 1922.

SELFHAIDJUSTINGTRANSMISSION MECHANISM. vlrginal application filed December 29,' 1920, Serial No. 433,930.

Divided and uns application ined serial No. 552,597.

and Figure 6 is an enlarged sectional detail of the safety valve 59.

Referring to the drawings and specifically7 to Figuresvl and 2, a friction disk 12 is splined upon a shaft 13 for rotation therewith, and is pressed upon by a spiral spring 11 surrounding the shaft 13. AA friction wheel 27, having a band 28 of frictional material around its periphery, is loosely mounted upon a shaft 17 and is in frictional engagementwith the friction driving disk 12. The fric-tion wheel 27 has a gear wheel 37 securedV thereto for Arotation therewith and the gear wheel 37 engageswith two in ternally threaded pinions 38 and 39, respectively mounted upon anld in screw engagement with threaded shafts 32 and 33, set parallel` to andY upon opposite sides of the shaft 17. The shafts'17, 32 and 33 are rotatably journaledin the frame 18 of the machine and the threads upon the shafts 32 and 33 are designated by the numeral 34.

lA collar 44 is splined upon the shaft 1T ,and is pressed against the vflat side of the friction wheel 27 b v a spiral spring 46 which surrounds the shaft 17. The opposite end of the spring 46 presses against a washer 47 on the shaft 17 and the degree of com` pression of the spring` 46 is regulated bv a sleeve 48, upon the shaft 17, provided with external threads 49 engaging with internal threads in an opening 59 through a slidable frame 42, to be later described. The sleeve 48 is provided with a milled portion for convenience in adjusting and a set screw 52,

set in a portion of the frame 42.` is prol vided for holding the sleeve 48 against cidental turning.

The collar 44 has a gear wheel 29 secure `-l thereon for rotation therewith and the gear wheel 29 engages with two 'pinions 30 vand 31 splined upon the shafts 32 and 33 rcspectively. Keyways are cut in the shafts 32 and 33 to depths `greater than the depths of the screw threads 34 thereon, and feathers carried by the pinions 30 and 31 engage with the keyways 35.

The gear wheel 29 is slightly larger in diameter than the gear wheel 37 and the pinions 30 and 31 are correspondingly smaller than the pinions 38 and 39. A frame 42 is slidably mounted upon the shafts 17, 32 and 33, enc-losing the friction wheel 27, the collar 44,' the gea-r wheels 29 and 37. and the pinions 30, 31. 38 and `39. Loose collars 4l and 43, upon the Shattsl, 32 and',

within lthe frame .42, maintain the .i parts within `the framev 42 in Vfixedspaced relationship to each other and to the frame-42.

eragebecomes.sufficient to enable the collar In operation, the disk.121.isrotated with and by the driving shaft .and this, in turn, rotates the engagingfrictionwheel 27. The collan44, whiclris pressed. into..frictional engagement with. L theV fiat ...side of` the ..friction wheel'27, tends to rotate with thefriction: wheel. 27 .andi to -carry the. shaft 17, upon which it isisplined, withqitfin rotation. Theshaft. 17 amay be.` loperatively connected1in 4any desired way-with themechanism to he. operated through this self. adjusting .transmission..mechanisnn and .the shaft 17 is designated in .the appended claims as theidriven shaft.

...The collar-lacarries'with itin rotation the: gear wheel 29 and this,.in turn, rotates fthe p'inions`30 and T31 indirectionssimilar to each other `and these. in turn, rotate the threaded shafts :32 and 33. upon which -they are .respectively.splined 1 The lfrictionwheel A 27,;0arries with it ini-.rotation the gearfwheel which rotates the `internally threadedpinions $.38 and 39.in like. direction tothe shafts 32.1and33` 'upon-` Which they are respectively mounted. ...andiwith lwhich .they respectively engage -their..threads Because of the; differences-:inthe diameters of the gear wheels 29 and 37 and oftheirrespectively.engaging p inions, the shafts `32 and 33 will normally be' driven a trifle :faster than (but in the 4same directions aas) the internally threaded pinions 28 4and 39 thereon. l-lence,.the pinionsf38 and 39--willscrew vupward upon the threaded. :shafts 32 and 33, carryingwith lthemf'thevframe42- and its contents,-and causing the friction wheel 27 to .engagethe friction disk 12 at progressively greater .distances from the axis of thefrictiondisk 12 and, consequently, progressively increasing the ratio ofthe'speed of the shaft 17 -to the speed :of the friction. disk 12.

lVhenthe resistance offered to the rotation of the shaft 17 becomes such that/it partially overcomes the frictional grip of the friction wheel 27 on theV collar -lllthere will follow partial .slippage ofthevcollar 44 and consequent lessening of the speed of the shafts 17, 32 and 33 with respect to the speed of the pinions 38 and 39, and the upward `travel* of the .saidmp-inionsmand the frame 42 will slacken proportionately. ."When the slippage of the collar 4:4 reaches a degree suilicient to slow up the-shafts I32 land 33 enough to equalize'their speeds 1with the: speed' ofA thexpinions 38' and39 there vw'illrbe no movement, either upward or downward, ofthevpinions 38.1and 39 or of the `frame42. W'hcn theV slippagey of the collar 44;.becomes `so 'great fas. to slow -the shafts32 and v33xhelow the speed ofthe pin- "io'nsaf38 :and .39fthese1pinions andthe lframe '-142' v'-"fwllfz be Yrrnovedixdemnwardly r. upon; the

Shafts "32 and 33, causinggtheifrictioniwheel 12 until a point is reached where the levtt' to rotatel the shaft 17 without slipping in A.-itsengagement. fwith' the friction wheel 27 .more .than the normal amount. required to .maintain the .pnions 38..ai1d"39rin position upon their respectivefshafts without movement longitudinally of thesaid-.shafts In this .construction it is .desirabletofso adjust the pressure ofthe.spring` cthat the collar 44 willalways slipf inits engagement withtthe .friction wheel .27. a .trifle more freadily than the friction wheel 2.7 willslip, in'its engagementwiththe.friction 'disk 12. When soadjusted, there will,..never be lanyslippage .of the. friction .`wheel.-.27.5.against the `friction i disk.. -12 and, .consequently,..l will.' be lonlythe minimum :of wiearrof-the'rfriction band 28 aroundwthetperiphery ofthefffric- .tion wheel 27.

"The @modified construction 'illustrated in Figures 3 to 6 inclusiveis. identical with theJ 4.preferred construction .already', described exce'ptthat therezis V.substituted 1 for the .frictionally.- i engaging .collar-:44 andffspring 46 a pneumatically engaging ,.device. .'It will. therefore,l be unnecessary. ...te .again `describe that partl ofthe construction .thatis identical.

.-.A cylindrical casing. V53fis. secured upon the friction Vwheel 271forsro-tation therewith yand airotor ltteis-splined uponthe Vshaft 17 within the casi-ng. .53. AIn `this construct-ion, the rotor, 14 vreplaces and functions 4instead of the collar lll in therpreferred construction andthe cylindrical casing. 53, and associated air compression-parts `take the place of the spring` i6 andits associated parts. in the preferred construction. l THerein nlies the only difference ybetween the/two; constructions.

The .casing -53f is divided into. .an .upper or rstorage chamber 55 and a lower or compres sion chamber. The upperchamber 55. is so constructed as to be in effect a hollow collar` the storage .chamber surrounding the... shaft 17 but that shaft not entering or passing through the. storagechamber. .Thelower chamberhas aportionrof .its ,casing53 progressively thickened-to form azcurved .cam surface which, at its thickest point. contacts ywith the rotorifltand then drops abruptly in thickness to .the normal.. thickness ofthe cas vxine: 53.

Slots .56. are. provided `in .the rot-ori 4&5 in which pump blades 57 vare adaptedtolslide. Spiral springs 58..normallyfnrge .the pump blades `57 outwardlyandinto contact with the casing.53. #.Vllhenthecasing '3-.is rotated with the frictionwheelf27z-to which it .is secured; air .is .compressed .between I the blades 57 andthe thick. portion. fof the ,cas-

:and-'is forcedilpvaid tllrtgh eres' ciA sagevvay 54 into the tank or storage portion 55. i so great that the resistance to .the further forcing of air therein is greater than the resistance offered to the rotation of the shaft 17 the rotor eivill be'rotated with the casing'` 53 onl the friction -ivheel 27 and Will carry with it in rotation the shaftl7 upon which the said rotor 44 is splined. The gear Wheel 29, Which is splined upon the shaft`17, will be rotated With that shaftfand` Willin turn, rotate the'ipinions 30 and 3l and, through. them, the threaded shafts 32 and 33, in the same manner asin the preferred constructionV-` The gear Wheel 37, which is secured to and rotatable With the friction Wheel .27, engages and rotates the internally threaded pinions 38 and 39 in the same mannerand with the same results as in the preferred construction.V w

The storage chamber 55 is provided With a spring valve 59 as an outlet for the air that is takeninto the casing 53 through the opening '60 therein andforced into the storage chamber 55 through the passageway 5ft Whenever the pressure of this airV exceeds the pressure of a spring tending to normally hold the valver closed. This valve 59 may be of any convenient` construction. As illusl trated, it consists of a conical opening in the Wall of the tank 55`Witha` conical stopper' (il fittinga therein and held by pressure of a spring; 62, Adjustment of the pressure vit-h which the stopper 61 is held in place is secured by adj Listing the tension of the spring by means of a screiv` 63 which engages with internal threads in a bracket 54 secured vto the casing` of` the tank or storage `chamber acts as a ,Q'uide for the free end of the screw` and a milled head 67 upon thev screw 63 facilitates adjustment With it.

Since the resistance of this valve 59 to the rescape of air from the storage chamber' determines the degree of rigidity `in the engagement between the rotor 4: and the friction Wheel 27, it will be evident that the tendency to slippage inthis engagement Will be dependent upon the adjustment of that valve, just as it is dependent upon the adjustment of the spring 46 in the preferred construction. The valve 59`should, therefore, be adjusted so that the rotor 'ist will alivays slip inits engagement throuj the air compressed in the casing 53 and storage` chamber 55) a trifle more readily than the friction wheel 27 will slip in its frictional VVengagement with the friction disk 12.

It will be evident that numerous departures from the constructions specifically illustrated and described herein mightv be When compression in the tank 55 becomes made -without departing` from the spirit of my invention. Hence, I do not Wish to be understood as limiting the scope of my invention to such specilicconstructions or as acquiescing in any limitations to the same except such as may be imposed by the prior state of the art or included 'in the claims forming a part of this application.

I claim:

l. In self adjusti'igtransmission mechanism, the combination of a friction driving disk, a friction Wheel driven by said friction driving disk, a driven shaft, a member rotatable With said driven shaft, means for yieldably enragingr the said member and the said friction Wheel, and means controlled by the degree of yield of the said member and the said friction Wheel in their engagement with each other for varying the ratio of the rotary speed of the said driven shaft to the rotary speed of the said friction drivingr disk inversely to variations in the degree of resistance offered to the rotation ofthe said driven shaft. i

2. ln `self adjusting transmission mechanism, the combination of a friction driving; disk, a friction Wheel driven by said friction driving disk, a driven shaft, a member rotatable With said driven shaft, means for yieldably engaging the said member and the saidfriction wheel, means for adjustingthe `intensity of operation ofthe said last named means` and means controlled by the degree of yield of the said member and the said friction Wheel in their engagement with each other for varyingthe ratio of the rotary speed of the said driven shaft to the rotary speed of thesaid friction driving)r disk inversely to variations in the degree of resist- 'ance offered to the rotation of the said driven shaft] 3, ln self adjusting transmission mecha.- nism, the combination of a friction driving membera friction driven member engaging the said friction driving member, a driven shaft, a member adapted to rotate the said driven shaft, means for yieldably engaging the said member with the said friction driven member, and means controlled by the degree of yield of the said member in its engagement with the said friction driven member for automatically varying the ratio of the speed of the said driven shaft to the speed of the said friction driving' member inversely to variations in the degree of resistance offered to the rotation of the said driven shaft 4:.' In self adjusting transn'iission mecha- `nism.fthe combination of a `friction driving member, a friction driven member engaging `the said friction driving member, a driven shaft, a member adapted to rotate the said drivenshaftq means for yieldably engasinff the said member with the said friction driven member, means for adjusting the intensity of operation ofthe said-last named means, and means Controlled bythe degree of yield ofthe- `saidj member;- inits-engagement ivith the, said -frietion driven i member for Vantomatioa-lly varyingfthe ratio yof. the speed of the saidf drivenshaft to the speed of the` said frictionl driving'` member. inversely to `variations in `the k(.ilreggree ofresista-nee offered to the rotation of the said driven shaft.

' 5.-,In self-adjusting transmission mechanism, the eombination of a frictionfdriving member,' a friction driven member `engaging the saidffriction driving member,` a` driven shaft looseli7 .mounting the said friction driven;.inernben44 a rotatable membersplined iiiionjsaid .driven shaft, means for yieldably engaging `thesaid rotatable member `vvitli thesaidfrietion driven membeipand means controlled-by the ydegree of yield .of the said rotatablememben in its engagement With the i said*friction-driven member under `varying degrees-bf-4 resistanoe offered to lthe rotation off-,thesaid driven shaft forI automatically varying the ratio of the speed of the said driven shafttothespeedof the said friction driving` member .-inversely tothe variations .inthe saiddegrees of resistance offered to the rotation of thesaid driven shaft.

6. r.Inc-@Selfadj Listing :transmission mechathecombination of afriotion driving rrieniber,V al friction driven member en gaging thef'said friction drivingmember, a driven shaft yloosely mounting the said friction driven, member. a: rotatable member splined iipon `the saidfvdrivenlshaft, means for` yieldahlvgengaging the said rotatable member with the said jfriotiony driven member, means for adj-Listing the intensityY 'of operation ofthe said-last named means, and means oontrolled bvthendegree Vof yield of the said rotatable member in its engagement with the said frio- Vtiondriven member under varying degrees of're tane'e offered to the rotation of the -eaid ldriven sh-aft for anto-maticalliT varyingi the-ratio of `the speed of the isaiddriven shaft to the sneed ofthe said friction Adriv- --ing iniember inversely to i the variations in the said degreesof=resistanee offered to the rotation loffthe saidi driven shaft.

'7,l Iii-:self adjusting` transmission mechanism; Jdie combination; of lafriotion driving disk, agfriction ivheelrotatable by and movablefradial-lvof' the said friction i driving disk i inl continuons engagement therewith, a .driven'shaft loosely moiintingthe said lfriction ivh eel. forfrotation' thereon and for lon-- n'itiidinal movement thereof and-thereon, a rotatable-member splined v*ii-pon said driven sha-ft;` means for vieldablyV engaging the said .rotatable i member iivith the. said friction .ivheeL means-for adjusting the intensity of oneratrion` of -the said I last nam edmeans at Vvfil liv-and means Control-led. by the -degree of vield of the said rotatable-member in; its en .gagenientwivith the;.-;saidf-frictionwheel for liee-,8,99

aiitomatieally so i `moving i the said .frirton Wheel i diallyoffn'the. said .friction driving dislrasto vary the ratioof therotary speed oflthe said drivenshaft to thespeed of the said .friction driving disl; inversely to varia-` tionstin .the degree vof'resistance offered to the rotation ofthesaid driven shaft.

` 8. Ins-selfgfadjiisting transmission mechanis; ,the combination ofa driving member,

aqdr-iven .shaft a. rotatable memberl loosely i mounted upon the said driven shaft and driven by the saiddriving member, a rotatable element moiinted. upon thesaid driven Vshaft-ind adapted to rotate the said driven shaft therewith,` means for yieldably engagingthe said rotatable member and the said rotatable; element ivith each otherj and meansoontrolledby the degreeofyield in the engagement ofthe saidmember andthe said element ivith eaehnther for aiitomatically Varying the ratio of Ithespeed ,of `the saiddriven shaft to the speed of the said driving:,member inversely. to variations in the. degree of resistance offeredto -the rotation .of thesaid drivenshaft(` y 9.` in self-.adjustingtransmission .mechanisin, the combination of adriving member, a.; driven ishaft, lspeed changing mechanism interposed between the saiddriving member and the said driven shaft-.for .transmitting the rotary motion ofthe-said driving-meniber to the-said driven shaftin varying speed ratios and-including tvvo v'rotatable members mounted upon the same shaft and in yieid- .able engagement with each other, and auto- -matie means eontrolled by the degree of yieldin the engagement ofthe said tvro members for varying the ratio of the rotary speed of the said driven shaft to the rotary speed of the said divingr member inverselj.Y to variations -inthe degree of resistance offered to the rotation of the said driven shaft.l i v "lili nself adjusting` transmission mechavnisnn-the combination lofa driving'. member, a driven shaft, speed:changing` mechanism interposedbetivcen `the said driving member kand the said driven shaft for `transmitting` the .rotary motion of theV said driving meniber to the said driven sha 't in varying sneed ratios and-including tivo rotatable members mounted iipon the Vsame shaft and in frietional engagement with each other.y and antomatic .means Controlled by the degree of slippageiin the engagement of the said tvo members-for varying the ratio of the ro-V tary speed of the said driven shaft to the rotary` speedpof the said driving member indriven shaft. v ll. In self adiiisting` transmission mechanismr the-'combination of a` drivingrfrietion vdislna driven shaft,i a friction vvheel driven hysaid driving-friction;disk and loosely rio Iiso

mounted upon the said driven shaft for free rotation thereon and for longitudinal movement thereof and thereon, such movement being radial of the said driving friction disk, a friction member mounted upon the said driven shaft and 'adapted to rotate the said driven shaft therewith', means for pressing the said 4friction member into frictional engagement with the said lfriction wheel,

y means for adjusting the intensity of operation of the said last named means at will, and automatic` means controlled by the de- `grecs of slippage of the said friction member in its engagement with the said friction wheel 'under varying degrees of resistance offered to the rotation of the said driven shaft for so moving the said friction wheel. longitudinally vof and upon the said driven shaft and radially ofthe said driving friction disk as to maintain the ratio of the rotary speed of the said driven shaft to the rotary speed of the said driving friction disk inversely proportional 'to the degree of resistance offered to the rotation of thesaid driven shaft.

12. In self adjusting transmission mechanism, the combination of a driving member, a driven shaft, two members mounted upon said driven shaft in frictional engagement vwith each other, andautomatic means 4controlled by the degree of slippage of the said two members in their engagement under varying degrees of resistance offered to varying degrees of resistance offeredcto the Cil rotationof the said driven shaft for varying the ratio of the rotary speed of the said driven shaft to the rotary speed of the said driving member inversely to variations in the degree of resistance offered to the rotation of the said driven shaft.

14. In transmission mechanism, the combination of a driving shaft, a driven shaft, speed changing mechanism operatively interposed between said shafts and including a member mounted for free rotation upon said driven shaft, an element mounted upon said driven shaft to rotate said driven shaft therewith and yieldably engaging said member, and automatic means controlled by the degree of yield in the engagement of `said element with said member, above or below a given degree of yield, for so changing the relationship of the said member to the balance of the said speed changing mechanism as to vary the ratio of the rotary speed of the said driven shaft to the speed of the said driving shaft inversely to vari- 70. ations in the degree of resistance odered to the rotation of the said driven shaft.

15. In transmission mechanism, the combination of a driving shaft, a driven shaft, speed changing mechanism operatively interposed between said shafts and including a member mounted for free rotation upon said driven shaft, an element mounted upon said driven shaft to rotate said driven shaft therewith and frictionally engaging said member, and automatic. means controlled by the degree of slippage in the engagement of said element with said' member, above or below a given degree of slippage, for so changing the relationship of the said member to the balance of the said speed changing mechanism as to vary the' ratio of the rotary speed of the said driven shaft to the speed of the said driving shaft inversely to variations in the degree of resistance o'ered to the rotation of the said driven shaft.

16. n transmission mechanism, the combination of a driving shaft, a driven shaft, speed changing mechanism operatively interposed between said shafts and including a member mounted vfor free rotation upon said driven shaft, an element mounted upon said driven shaft to rota-te said driven shaft therewith and yieldably engaging said member, and automaticmeans controlled by the degree of yield in the engagement of said element with said member under` varying degrees of resistance offered to the rotation of the said driven shaft, above or below a given degree of yield, for so changing the relationship of the said member to the balance of the said speed changing mechanism as to vary the ratio of the rotary speed of the said driven shaft to the speed of the said driving shaft inversely to variations in the degree of resistance offeredtothe rotation at the said driven shaft.

17. In transmission mechanism, the combination of a driving shaft, a driven shaft, speed changing mechanism operatively interposed between said. shafts `and including a member mounted for free rotation upon said driven shaft, an element mounted upon said driven shaft to rotate said driven shaft therewith and yieldably engaging said member, automatic means controlled by the degree of yield in the engagement of said element with saidmember under varying degrees of resistance offered to the rotation of the said driven shaft, above or below a given degree of yield, for so changing the relationship of the said member to the balance of the said speed changing mechanism as to vary the ratio of the rotary speedoi" 13o means for adjusting the intensity of the cn- ;ragemen't between the said element and the said member.

18, In transmission mechanism, the combination ofa driving` friction disk, a driven l0 shaft, `a friction' wheel engaging the said friction disk and rotatably and slidably mounted upon said driven shaft to be movable" radially of and in Vengsgement with said friction dislg'a .member splined upon saiddriv-en shaft and pressed into frictionalengagement with said friction wheel, and automatic means controlled bythe degree of effectiveness of the frictional engagement between the said member and the saidfriction wheel under :varying degrees of resistance-offered to th'e rotation of the said driven shaft for sovaryingthe positionof thesaid friction wheel with respect to the axis of thesaid friction dislr as to vary the ratiofofthel rotary speed of the said driven shaft to the rotary speed of the said friction disk-inversely to variations in the-'degrees ofresistance offered to the rotation" of the said driven shaft.

19.: In transmission mechanism, the combinationof a driving :rotatable friction member, a driven shaft, a lfriction wheel engaging the'l said friction member and rotatably and.slidablyfmounted upon said driven shaftto be' movable with lrespect to tli'e'ariis of the said friction member while remaining in engagement-therewith, an element splined upon said driven shaft1 and pressed into frictional' engagement with saidvfriction wheel, and auto-matic means controlled by theY degree of effectiveness of thefrictional engagement between the said elementI Aandthe saidV frictionwheel under varyingdegrees .of resistance offered to the rotation Aof the-said driven shaft for so Avaryingthe position of the' saidfriction wheel with respect to the axis of thesaid frictionmemberv as to vary the ratio of the rotary speedof the said driven shaft to the rotar'yispeedgof the Vsaid friction member inverselyito variations inthe degree of resistance offered to the rotation of the said driven shaft.

20.' In `transmission mechanism', the combination*l of a driving rotatable friction membr,'a'driven shaft, a friction wheel enz@raging thesaid-friction member and rotatablyjand slidably mounted uponsaid driven shaft-to be"v movable with respect to the `axis of'fthefsa'id friction' member while remaining" infiengagement therewith, an element splined upon said driven shaft, means adapted to 'press said element intofric'- tional engagement withI said friction wheel', means adapted to adjust the last named means asto the intensity of the pressure of said element against said friction'` wheel, and automatic means controlled by the degree ofeffectiveness of the frictional engagement between the said element and the said friction wheel under varying degrees of resistance offered to the rotation 0f the said driven shaft for so varying the position of the said friction wheel with respect to the axis of the said friction memberas to vary the ratio of the rotary speed of the said drivenshaft to the speed of the said friction member inversely to variations in the degree of resistance offered to the rotation of the said driven shaft.

21. In transmission mechanism, the combination of a friction drivingmember, a friction wheel engaging said friction driving member, a driven shaft loosely mounting said friction wheel for free'rotation thereon, anA 'element mounted upon' said drivenwshaft for rotation therewith, pressure means adapted to press! said' element into frictional engagement with said friction wheel, and means for so adjusting` the intensity ofv said pressure means that any slippage that may oc cur through resistance offered to the rotation of the said driven shaft will occur between the said element vand the said friction wheel and not between the said friction wheel and the said friction driving member.

22,'In transmission`mechanism, the combination of a friction drivingy member,- a driven shaft, a friction .wheell mounted 'for free rotation upon said driven shaft, pres sure means adapted-,topress the said friction driving member into frictional engagement with vsaid friction wheel, means adapted Vto adjust the intensityv of `the'pressure means aforesaid to regulate the-intensity of the .frictional' engagement between the said friction driving member andV the said friction wheel, .an element ',mounted upon said driven-shaft for rotation therewith and pressed into frictional engagement with said friction wheel, and means for adjusting the intensity of the pressure ofthe said elementv against the said friction wheel in such proportion to the intensity of the pressure of the said friction driving member against the said friction'wheel as to insure IUS slippage in the -frictional engagement be tween' the said element and the said friction wheel more readily than between the said friction driving member and the said friction wheel. Y

23. In transmission mechanism,v4 the' combination of av friction driving member, a frictionfwl'ieel.driven by said friction driving member, a shaft mountingsaid friction wheel for free rotation thereon, and an element secured upon said shaft for rotation therewith and frictionally engaging said friction wheel with a lesser degree of positivity than that with which the said friction driving member engagesthe said friction wheel.

Qf-l. In transmission mechanism, the combination of a friction driving member, a friction wheel driven by said friction driving member, ashaft mounting said friction wheel for free rotation thereon and for movement radially of the airis of said friction driving member, an element secured upon said shaft for rotation therewith and frictionally engaging said friction wheel,y with a lesser degree of positivity than that with which the saidV friction driving member engages the said friction wheel, and means controlled by the degree of effectiveness of the frictional engagement between the said element and the said friction wheel for moving the said friction wheel with respect to the axis of the said friction driving member.

In transmission mechanism, the combination of a shaft, a rotatable driving member mounted for free rotation upon said shaft and for movement longitudinally of and upon said shaft, a rotatable driven member mounted upon said shaft for rotation therewith and for movement longitudinally thereof and thereon and frictionally engaging the said driving member, and means controlled by the degree of slippage in the frictional engagement between said members for moving the said members longitudinally of and upon the said shaft.

26. ln transmission mechanism, the combination of a shaft, a rotatable driving member and a rotatable driven member mounted upon said shaft and movable longitudinally thereof and thereon and frictionally engaging each other, and means controlled by the degree of effectiveness of the frictional engagement between the said members for moving the said members longitudinally of and upon the said shaft.

27. ln transmission mechanism, the combination of a driving shaft, a driven shaft, a wheel driven by said driving shaft and rotatably mounted upon said driven shaft, an element mounted upon and secured for rotation with said driven shaft and frictionally engaging a side of the said wheel, speed changing mechanism, and means controlled by slippage of said element in its frictional engagement with said wheel for automatically adjusting the said speed changing mechanism to vary the ratio of the rotary speed of the said driven shaft to the rotary speed of the said driving shaft inversely to variations in the degree of resistance offered to the rotation of the said driven shaft.

28. In transmission mechanism, the combination of al rotatable driven wheel, a shaft mounting said driven wheel for free rotation thereon and for movement longitudinally thereof and thereon, an element splined upon said shaft and in frictional engagement with said driven wheel, and means automatically controlled by the degree of effectiveness of the friction-al engagement between said driven wheel and said element and operating to cause movement of the said driven wheel and the said element in one direction longitudinally of and upon the said shaft when the degree of slippage between the said driven wheel and said element is less than a. given degree and to cause the said driven wheel and the said element to have no movement longitudinally of and upon the said shaft when the degree of slippage between the said driven wheel and the said element is exactly the said given degree and to cause movement of the said driven wheel and the said element longitudinally of and upon the said shaft when the degree of slippage between the said driven wheel and the said element exceeds the said given degree, the last named movement being in direction opposite to that taken by the said driven wheel and said element when the said slippage is less than the said given degree.

29. In transmission mechanism, the combination of a friction driving member, a friction driven member engaging the said friction driving member and movable radially of the axis of said friction driving member to vary the ratio of the rotary speed of said friction driven member to the speed of said friction driving member, a driven shaft rotatably and slidably mounting the said friction driven member, an element splined upon the said driven shaft and fric tionally engaging a side of the said friction driven member with a degree of intensity to normally allow of a given degree of slippage in the frictional engagement between the said friction driven member and the said element, and means controlled by any degree of slippage in said frictional engagement below the said given degree for moving the said friction driven member and the said element longitudinally of and upon the said driven shaft in such direction as to increase the ratio of the rotary speed of the said. friction driven member to the speed of the said friction driving member and controlled by any degree of slippage in said frictional engagement above said given degree for moving the said friction driven member and the saidelement longitudinally of and upon the said driven shaft in such direction as to decrease the ratio of the rotary speed of the said friction driven member to the speed of the said friction driving member.

80. ln transmission mechanism, the combination of a driven shaft, a rotatable member mounted upon said driven shaft for free rotation and longitudinal movement thereon,

a driving shaft, means for transmittin rotary motion 'from Said driving slia-it to said `rotatable member at speed ratios varying with the position ofthe said rotatable memr ber upon the said driven shaft, ali-element splined upon the said driven shaft and yield-- ably engaging the said rotatable member in suoli manner as to normally allow a given degree of yield in said engagement, and means controlled by any degree of yield in said engagement below said given degree for moving the said rotatable memberlongitiidinally of and upon the said driven shaft in such direction as to cause the said rotatable member 'to be rotated at a higher ratio oi" speed to the speed of the said driving shaft and controlled by any degree of yield in said engagement above said given degree for moving the said rotatable member longitudinally of and upon the said driven shaft in suoli direction as to cause the said rotatable member to be rotated at a lower ratio of Speed to the speed of the said driv ing shaft.

CHARLES H. Ginn 

